Experimental study on coal dust wettability strengthened by surface active ionic liquids

Zhang, Weiqing; Hu, Qian; Jiang, Shuguang; Wang, Li; Chai, Jinxiang; Mei, Jingxin

doi:10.1007/s11356-022-19191-1

Cited by 22 publications

(5 citation statements)

References 82 publications

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“…160 ± 5 mg of the coal sample was put into the compression mold to make coal tablets. Previous studies had found that the contact angle changed continuously until droplet stabilized or the surface of coal tablets was completely wetted and is displayed in Figure . Figure b describes the initial stage of droplets contacting the surface of the coal tablets having a larger contact angle.…”

Section: Experiments and Methodsmentioning

confidence: 99%

Effect of Sophorolipid Adsorption on the Coal Microstructure: Experimental and Wettability Mathematical Model Discussion

Wang,

Zheng,

Jiang

et al. 2023

Langmuir

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Green biosurfactants are emerging as a promising area of research. However, there is a limited focus on the adsorption and wetting characteristics of biosurfactants on coal dust. This study explores the effects of sophorolipid (SL) biosurfactants on the microstructure and wettability of different coalification degree coal. The microstructure parameters of SL adsorbed on coal dust were measured using a surface tensiometer, contact angle analyzer, and particle size analyzer. The results indicate that SL has the lowest critical surface tension, leading to a 9.25°decrease in the contact angle for low-rank bituminous coal (YZ-LRBC). Furthermore, SL significantly altered the particle size distribution of lignite (NM-LC) and YZ-LRBC. The pore size structure of SL-infiltrated coal dust was quantified using a specific surface area analyzer, revealing a decrease in the specific surface area and an increase in the average pore size. The infrared analysis demonstrated that SL permeation significantly increased the percentage of hydrophilic functional groups (hydroxyl structures) while reducing the hydrophobic functional groups (aliphatic hydrocarbon and aromatic structure). Based on the measured microstructure parameters, a regression equation for contact angle was established: [contact angle (°)] = 73.800 − 0.860 × [D10 (nm)] + 4.280 × [specific surface area (m 2 /g)]. Notably, the characteristic particle size D10 had a significant negative effect on the contact angle, while the specific surface area had a significant positive effect. These findings provide a theoretical foundation for the application of biosurfactants in water injection to reduce dust and improve the wetting efficiency.

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Section: Experiments and Methodsmentioning

confidence: 99%

Effect of Sophorolipid Adsorption on the Coal Microstructure: Experimental and Wettability Mathematical Model Discussion

Wang,

Zheng,

Jiang

et al. 2023

Langmuir

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“…③ Due to the hydrophobic nature of coal dust [28][29][30][31], it was difficult to reduc concentration of coal dust that entered the gallery after it was not captured at the bore According to the above analysis, it was concluded that the dust extraction pipe tion, the slag discharge pipe angle, and the cavity diameter were the key structura rameters affecting the dust collection performance of the device.…”

Section: Results and Analysis Of The Performance Of The Original Orif...mentioning

confidence: 99%

“…3 Due to the hydrophobic nature of coal dust [28][29][30][31], it was difficult to reduce the concentration of coal dust that entered the gallery after it was not captured at the borehole.…”

Section: Design Of the Novel Orifice Dust Collection Devicementioning

confidence: 99%

Design and Optimization of a Novel Dust Collection Device for Underground Dry Drilling Based on Numerical Simulation and Field Testing

Liu,

Zhang,

Zhou

et al. 2023

Processes

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To address the challenge of dust control during dry drilling of underground coal seams, a novel dust-collecting device for micron-size dust was designed and tested. To determine the optimal structural parameters of the dust collector, numerical simulations were employed to investigate the influence of the positions of the dust extraction pipe, slag discharge pipe angle, and cavity diameter on the distributions of the airflow velocity field and the pressure field inside the device. The findings revealed that the best performance was achieved when the dust extraction pipe was positioned in the lower part of the cavity, the angle between the slag discharge pipe and the cavity was 45°, and the cavity diameter was 300 mm. Under these conditions, the average airflow velocity in the dust extraction pipe reached 8.32 m/s, the maximum negative pressure at the pipe’s mouth was recorded at 1012.38 Pa, and the velocity of the dusty airflow in the cavity remained below 4.38 m/s. Dust capture performance was evaluated through on-site testing in the Taoyuan Coal Mine. The results demonstrated that using the novel device, the dust suppression rates at the slag discharge port, the connection between the device and the drill pipe, and 6 m from the drill hole on the downwind side increased by 92.5%, 88.5%, and 89.1%, respectively.

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“…Jin et al prepared and characterized a composite dust suppressant for coal mine [6]. Generally speaking, the components of wetting type dust suppressant are mostly surfactants, such as water-absorbent resin dust suppressant with cation [7] and anions Cl-, Br- [8], non-ionic surfactants APG0810 and PPG400 [9], 2-Alkyl-1-diethylenediaminimidazoline gemini surfactants [10]. Another type of wetting suppressant is hygroscopic agent, such as carboxymethyl chitosan [11], which can absorb water in the environment to keep the dust moistness.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Dust Suppression Effect and Performance of New Nano-Composite Dust Suppressant

Song

et al. 2022

IJERPH

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In this paper, a nano-composite dust suppressant has been proposed to make up for the deficiency in wettability and moisturizing performance of a nanofluid dust suppressant. The nanometer material Al2O3, super absorbent polymer, carboxyl methyl starch sodium, and polyacrylamide were selected as effective components of it. The surface tension of the solution, evaporation resistance, and uniaxial compressive strength (UCS) were chosen as evaluation index to compare the suppression performance, these dust suppressants include the water, nanofluid dust suppressant and nano-composite dust suppressant, and the surface morphology of each tested material was observed by micro image analysis system. It was found that the surface tension and water loss rates of the nano-composite dust suppressants, respectively, decreased by 31.96% and 7.1%, and the maximum UCS increased by 31.82% compared with data of nanofluid dust suppressants. Since the nano-composite dust suppressant has good dispersion, permeability and bond performance, the suppressant film has fewer micro-cracks from the photos of microscopic image; it can improve the compactness and integrity of dust consolidation to prevent the evaporation of water and dust re-entrainment.

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Experimental study on coal dust wettability strengthened by surface active ionic liquids

Cited by 22 publications

References 82 publications

Effect of Sophorolipid Adsorption on the Coal Microstructure: Experimental and Wettability Mathematical Model Discussion

Effect of Sophorolipid Adsorption on the Coal Microstructure: Experimental and Wettability Mathematical Model Discussion

Design and Optimization of a Novel Dust Collection Device for Underground Dry Drilling Based on Numerical Simulation and Field Testing

Experimental Study on Dust Suppression Effect and Performance of New Nano-Composite Dust Suppressant

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